As you all know, special equipment operators need to pass training and examinations before they can take up their posts after obtaining the certificates. The editor will share with you the special equipment Q4 project bridge crane driver exam questions
"Special equipment operator exam" question bank Q4: bridge crane driver
1. When the traveling speed is greater than 120m/min, the buffer is used () A, rubber slowing artifact B, spring slowing artifact C, hydraulic slowing artifact [Answer] C
2. The driver and related personnel should cut off () and hang up the warning sign when inspecting and maintaining it. A. Total power [Answer]: A
3. Sudden failure of the brake of the lifting mechanism caused by the electrical aspect should be ().
A. Send an emergency signal
B. Pull down the knife and turn on the power supply
C. Pull down the emergency opening [Answer] C
4. In addition to careful inspection of the dangerous section of the plate hook, check the bushings, pins, etc. and other fasteners for looseness and wear. correct
5. Use at least three wire ropes to install through-cards, and the distance between the through-cards is 6 times the diameter of the wire rope, and should not be less than 140mm. A, correct B, wrong [answer] A
6. Before closing the main switch of the console, all controllers should be in the zero position. A, correct B, wrong [answer]: A
7. Pulleys made of metal, the cracks are not long and can be used continuously. A, correct B, wrong [answer] B
8. Cranes operating in the open air should stop operating when there is a strong wind of level 6 or above. A, correct B, wrong [answer]: A
9. The lifting object is connected to the ground or other objects. As long as the object is not heavy, it can be lifted. A, correct B, wrong [answer] B
10. The smaller the coil diameter of the hoisting mechanism, the greater the damage to the wire rope. A, correct B, wrong [answer] A
11. The lifting mechanism is composed of a power unit, a deceleration device, a roller slip and a braking device, etc. A, correct B, wrong [answer] A
12. When the crane is walking with load, the weight should not be more than 500mm away from the ground. A Correct B, Wrong [Answer]: A
13. In order to ensure the safety of the object during the turning process, the crane driver should () A, correctly estimate the weight of the object and the position of the center of gravity B, repeatedly use the trolley brake C, correctly select the lifting point and the binding position D, and control the turned object at all times [Answer] ACD
14. Object flipping is a kind of operation frequently encountered by crane drivers. The common ones are () Tumble B, Swim C, Belt D, Aerial Flip [Answer] ABCD
15. Requirements for aerial overturning of objects () A. Reasonably choose plan B. Two cranes cooperate with each other C. Correctly choose lifting points D and master the operation skills proficiently [Answer]: ACD
16. During the hoisting process of objects, attention should be paid to () A. It is not allowed to reverse over the personnel B. It is not allowed to move on the wire. C. The warning signal is issued in time. D. Keep a distance of 0.2m from the ground object [Answer] ABC
17. When the crane is lifting, it is difficult to balance the heavy objects, so you can put and float the heavy objects on the hanging objects to adjust the balance. A, correct B, wrong [answer] B
18. The crane should send out a warning signal when passing or staying over the head of the crane. A, correct B, wrong [answer]: B
19. Crane load test. The dynamic load test should be carried out at 1.1 times the rated load, and the crane mechanisms should work normally. A, correct B, wrong [answer]: A
20. If abnormal phenomenon or abnormal noise occurs in the transmission mechanism of the crane, the operation should be stopped. A, correct B, wrong [answer] A
21. The working level of the crane is divided according to the rated lifting capacity and the load condition. A, correct B, wrong [answer]: B
22. When the crane is working, do not pull heavy objects diagonally. A, correct B, wrong [answer] A
23. When the crane is working, the objects are not bound tightly and should not be lifted. A, correct B, wrong [answer]: A
24. When the crane is overhauling electrical equipment, only electricians are allowed to work with electricity. A correct B, wrong [answer] B
25. The reason why the brake can't be opened is ()
A, the main spring is damaged
B. The electromagnetic coil is burned out
C. The movable joint is stuck
D. Improper use of oil waves [Answer] BCD
26. The reason why the brake can't stop is ()
A. Excessive wear of brake shoes
B. The chain joints of the lever are stuck
C. There is oil stain on the brake wheel
D. The lock nut is loose [Answer]: ABCD
27. Only during the dynamic load test, the main and auxiliary hooks are allowed to be activated at the same time, and they are not allowed to be activated at the same time. A, correct B, wrong [answer] B
28. The adjustment of the brake can be divided into three aspects: braking force distance, working stroke and clearance. A, correct B, wrong [answer]: A
29. When the electrician repairs the equipment, the crane () shall be on-site to check whether it is qualified after the repair.
A. Crane driver
B. Production dispatcher
C. Lifting command [Answer] A
30. The common types of turning objects are () A, turning over B, turning over C, turning over D, turning over in the air [Answer] ABCD
31. Before turning over an object, you should first understand () A, weight B, shape C, structural feature D, and nature of the object being turned over. [Answer] ABCD
32. Fire fighting methods are: () A isolation method B cooling method C asphyxiation method D chemical interruption method [Answer]: ABCD
33. The operator must have a comprehensive understanding of () and the weight and distribution of components before operation.
A. On-site working environment
B. Driving road
C. Overhead wire
D. Building [Answer]: ABCD
34. The general appearance of diesel engine overheating is ().
A. Engine oil temperature rises
B. Fuel temperature rises
C. The temperature of outlet water rises
D. The exhaust temperature rises [Answer] ACD
35. When the controller is closed, the reason why the motor is not special is usually () A, one-phase power failure B, no voltage in the circuit C, the controller contact is not in contact D, operation error [Answer]: ABC
36. The role of lubricating oil is A, lubrication B, cooling C, cleaning D, sealing [Answer]: ABCD
37. The electrical protection box is mainly composed of (). A. Air switch B, overcurrent relay C, contactor D, fuse [Answer]: ABCD
38. Those that comply with the “ten no-hanging” requirements for lifting operations include () A. The cable operator does not wear a safety helmet and does not hang B. The work piece is not hanged underground.
C. The workpiece is tied up, and the hanging is not firm.
D. The safety device of the hoisting machinery fails to be lifted [Answer]: BCD
39. Hanging is not allowed when working directly on objects or when people are standing on the equipment. A, correct B, wrong [answer] A
40. In the working area of the rotating crane, personnel should stand outside the rotating range of the crane's moving pipe. A, correct B, wrong [answer] A
41. Under normal circumstances, most truck-mounted cranes can also carry out lifting operations in front of the truck. A, correct B, wrong [answer] B
42. When the lifting object swings back during operation, the gear position of the controller should be reduced to reduce the vehicle speed. A, correct B, wrong [answer] A
43. During operation, during temporary stop or power failure, the heavy objects must be unloaded and the hook must be raised. A, correct B, wrong [answer] A
44. The current that is fatal to the human body is 50 mA. A, correct B, wrong [answer]: A
45. In normal operation, reverse braking is strictly prohibited. A, correct B, wrong [answer] A
46. As long as there are commanders, objects buried in the ground or frozen on the ground or equipment can be lifted. A, correct B, wrong [answer] B
47. The hoisted items must be lifted to a safe height, generally from the ground to the bottom of the item () meters in order to move horizontally.
A, 1
B, 2
C, 4
D, 05 [Answer]: D
48. It is not suitable to be used as a lifting rope (). A. Mixed winding rope B, cross winding rope C, smooth winding rope [Answer]: C
49. Use an oil pool to lubricate. If there is an oil dipstick, add oil to the tooth surface of the submerged gear (). A, lowest B, middle C, highest [answer] A
50. For long-distance heavy-load descent, it is forbidden to use () method to descend. A, fast B, slow C, reverse braking [Answer]: C
51. During the entire lifting process, heavy objects shall not swing or rotate. A, correct B, wrong [answer] A
52. The reasons for the rapid wear of the wire rope are (). A, overload use B, dirt, lack of lubrication C, pulley or roll diameter is too small
D. The size of the trough does not match the diameter [Answer] BCD
53. The main beam is made into a certain degree of camber for (). A. High strength, material saving B, increase load capacity C, eliminate or reduce the additional resistance of the trolley during operation D, eliminate or reduce the self-slip of the trolley during operation [Answer] BCD
54. When shifting shifts, the driver who succeeds should conduct a no-load operation inspection, especially whether the () etc. are safe and reliable.
A. Cam switch
B. Limit switch
C. Emergency switch
D. Travel switch [Answer] BC
55. The static load test mainly checks () and other contents.
A. Braking performance
B. Whether there are cracks
C. Whether there is permanent deformation
D. Whether the connection is loose or damaged [Answer]: ABCD
56. All heavy objects should be prohibited from passing over people. A, correct B, wrong [answer]: A
57. In order to prevent collisions when turning over the processed workpiece, the method () can be used.
A. Catch and set up skids
B. Use a double trolley
C. Add a secondary rope [Answer]: C
58. When hoisting objects for the first time in each shift, the objects should be hoisted () m above the ground and then lowered to check the reliability of the lifting brake.
A, 2.0
B, 1.5
C, 1.0
D, 0.5 [Answer]: D
59. The height of the crane safety railing rod should be () A, 1000mmB, 1050mmC, 1100mm [Answer]: B
60. If the electrical appliance catches fire, the power should be cut off first. When the power is not cut off, fire extinguishing materials are prohibited to prevent electric shock. A, foam B, carbon dioxide C, dry powder
[Answer] A
61. Straighten the five fingers to indicate the position where the load should be landed. The gesture signal indicates () A. Hook down B. Preparation C. Indicate the landing direction [Answer]: C
62. Using artificial methods to change the speed of the motor is called (). A, frequency modulation B, speed control C, speed [answer] B
63. In the lifting operation, try to make the center of gravity of the goods on the two lifting ropes (( A, left B, right C, middle [answer] C
64. The wheel support device on the crane is roughly divided into () A, long shaft type B, short shaft type C, fixed shaft type D, rotating shaft type [Answer]: CD
65. Various instruments used on cranes should be in accordance with relevant regulations (). A, repair B, check C, replace D, prohibit walking [Answer] ABCD
66. The basic operation requirements of crane drivers are in addition to "stable" () A, quasi B, fast C, safety D, reasonable [Answer]: ABCD
D. Do a good job in repairing the crane [Answer]: ABC
68. Crane driver should do () after finishing work. A. The mechanical parking position is appropriate. B. The joystick should be set to the zero position. C. Cut off the power supply. D. Close the doors and windows. [Answer] ABCD
69. The crane driver should do a good job () and other tasks for the crane that it is operating. A. Adjust B, lubricate C, clean D, repair [Answer]: AB
70. Crane drivers should strictly implement the national and enterprise ()A, laws, regulations B, operating procedures C, rules and regulations D, work plans [Answer]: ABC
71. The mandrel of the crane hook (the pin () wears out and its diameter is 3~5% should be replaced. A, correct B, wrong [Answer] A
72. The service life of various crane mechanisms depends to a large extent on frequent and correct lubrication. A, correct B, wrong [answer] A
73. Before the crane starts driving, there is no need to ring the bell or alarm when no one approaches the crane. A, correct B, wrong [answer] B
74. The main cause of fire on the crane is sparks caused by the aging and short circuit of the insulation of electrical equipment. A, correct B, wrong [answer] A
75. Steel wire cores should be used for crane wire ropes at room temperature. A, correct B, wrong [answer] B
76. When hoisting on the channel, the weight should be 5 meters higher than the highest equipment on the ground. A, correct B, wrong [answer]: A
77. During crane operation, the reasons for instability and overturning are () A, overload B, oblique-stayed crane C, supporting ground subsidence D, braking inertia or excessive wind [Answer]: ABCD
78. During crane operation, adjust the boom length and elevation angle according to (). A. The volume of the heavy object, B, the weight of the heavy object C, the lifting height D, the lifting environment [Answer] BC
79. In addition to regular inspections, the contents of regular inspections of lifting equipment should also include () and so on. A. Wear and damage of main parts and components; B. Reliability of the indicating device; C. Power system and controller; D. Whether the technical information of the equipment is complete. [Answer] ABC
80. The contents of regular inspection of lifting equipment include () and so on. A. All safety and protection devices, B, the reliability of the indicating device, C, the performance of the brake and the wear of the parts, D, the wear of the wire rope and the fixing of the tail: [Answer] ACD
81. To improve production efficiency, reduce the intensity of movement, and ensure safety in lifting operations, the command line must master (() and organize the four elements of operating personnel. A. Lead on-site command B. Understand the working environment C. Understand the work objects D. Equipped with tools and equipment [Answer] BCD
82. The key to ensuring the safety and smooth turning of objects is () A, the weight of the object and the position of the center of gravity are correctly estimated B, the driver's proficient operating skills
C. Reasonable object size and shape
D. Choose the hanging point correctly [Answer] ABD
83. During operation, signals such as bells should be issued according to regulations (): A. Before the crane is started, B. The crane is in the process of lifting and the equipment fails C. When the lifting or dropping of the suspended object is D , When the hanging object approaches the ground staff during lifting. [Answer]: ABCD
84. The maintenance work system of () is usually implemented for cranes. A, preventive B, planned C, annual inspection D, predictability [Answer]: ABD
85. For some disc-shaped and flat-shaped workpieces that are not afraid of collision, the operation method of () should be adopted.
A, turn around
B. You turn
C. With translation [Answer] B
86. When inspecting the plate hook, the hook piece with surface cracks must be replaced in time. A, correct B, wrong [answer]: A
87. Check that the metal structure should be free from fatigue damage or weld leakage or cracks. A, correct B, wrong [answer] A
88. When checking the height limiter of the lifting mechanism, it must be carried out under no-load conditions. A, correct B, wrong [answer]: A
89. When checking the crane wheel, it is found that the wheel is cracked and should be replaced with a new one. A, correct B, wrong [answer] A
90. The maintenance cage is not often used, so the quality and reliability of its access can be lower than the requirements of the driver's cab. A, correct B, wrong [answer] B
91. When handing over shifts, the shift driver should introduce the problem of observing during the shift to the shift driver in detail, but there is no need to check the crane together.
A. Correct
B. Wrong [Answer] B
92. The succeeding driver should go to the scene 10 minutes in advance to check the machinery and make a good note. A, correct B, wrong [answer]: A
93. The contactor is an automatic electrical appliance, through which a smaller control power can be used to control a larger power lighting circuit. A, correct B, wrong [answer] B
94. Before accepting hoisting tasks, a technical plan for hoisting must be compiled. A, correct B, wrong [answer] A
95. Crane maintenance is divided into () A, daily maintenance B, primary maintenance C, secondary maintenance D, and tertiary maintenance [Answer]: ABC
96. Crane maintenance is divided into () A, daily maintenance B, key maintenance C, primary maintenance D, secondary maintenance [Answer]: ACD
97. The crane maintenance system has () A, timeliness B, preventive C, planned D, temporary [Answer]: BC
98. The complete machine performance test of the crane mainly includes () and so on. A. No-load test B, static load test C, dynamic load test D, noise measurement [answer] ABCD
99. Emergency measures taken by the crane driver when there is a sudden power failure during operation () A. Cut off the power B, turn the control handle to the zero position C, report to the electrician for overhaul D, hang heavy objects in the air [Answer] ABC
100. The main reasons for brake failure are () A, mechanical damage B, electrical failure C, improper operation D, long-term unused
[Answer]: AB
101. The reasons for the lower winding of the main beam are () A, improper manufacturing B, unreasonable use C, high temperature influence D, unreasonable repairs
[Answer]: ABCD
102. To develop a hoisting plan to choose a mobile crane, the crane's () parameters must be considered comprehensively, and a certain factor cannot be emphasized unilaterally. A. Lifting weight B, turning radius C, working speed D, lifting height [Answer] ABD
103. The purpose of adjusting the length of the main spring by the brake is to obtain a suitable braking torque. A, correct B, wrong [answer] A
104. In order to stop the load quickly during heavy-load and long-distance descent operation, reverse braking can be used. A, correct B, wrong [answer] B
105. When the heavy load descends, the handle should be quickly pushed to the last gear. When the suspended object reaches the stop position, the handle should be quickly pulled back to the zero position from the last gear without stopping in the middle. A, correct B, wrong [answer] A
106. When the grab blade is severely worn or deformed, it should be repaired or replaced in time. A, correct B, wrong [answer] A
107. The diameter of the crane wheel is mainly determined according to (). A. Lifting load B, wheel pressure C, speed [Answer]: B
108. When the crane reaches the end point or the two vehicles are close, what makes the crane travel switch act ()
A. Safety ruler
B. Buffer
C. Stopper [Answer] A
109. The operation of the electrical equipment of the crane must be carried out in strict accordance with the regulations, and the order of power supply is ().
A. Send the isolating switch first, then the load switch
B. First send the load switch, then send the isolating switch
C. The power transmission of isolating switch and load switch is independent of front and back.
[Answer]: A
110. If a short circuit or severe overload occurs in the circuit, the power supply needs to be cut off quickly. The time relay is responsible for this task.
A. Correct
B. Wrong [Answer] B
111. An anti-skid device should be provided on the hook. A, correct B, wrong [answer]: B
112. An anti-drop rope safety device should be set on the hook. A, correct B, wrong [answer] A
113. The main reason for brake failure is ().
A. The brake band gap is too small
B. Brake belt wear
C. Spring failure
D. Bring oil [Answer]: BCD
114. It is required in the "Ten Do Not Hang" system ().
A, overload without hanging
B. Do not hang flammable and explosive dangerous goods
C. Acute angles and blade angles are not properly cushioned
D. Illegal command is not suspended [Answer]: ACD
115. The protective box is used in conjunction with the cam controller or the master controller to realize the overload protection and short-circuit protection of the motor, as well as () and other protections.
A. Loss of pressure
B. Zero position
C, overload
D. Limit [Answer]: ABD
116. The content of maintenance work includes () A, cleaning B, tightening C, adjusting D, lubricating [Answer] ABCD
117. The principle of ensuring safe production is ().
A. Frequent maintenance of equipment
B. Operate in accordance with standards
C. Clean and orderly working environment
D. Proficiency in operation skills [Answer] ABC
18. The operator should buzzer to signal before carrying out crane () and other actions. A, rotation B, luffing C, walking D, hook lifting [Answer]: ABCD
19. When checking and repairing equipment, hooks or objects on hooks can be used to lift or send personnel. () A, correct B, wrong [answer]: B
120. It can be hung obliquely during emergency handling of production accidents to ensure smooth production. A, correct B, wrong [answer] B
121. In an emergency, the driver should immediately apply the reverse brake. A, correct B, wrong [answer] B
122. In the lifting operation, when using a very steel wire rope as a sling to lift long objects, as long as the strength of the steel wire is sufficient, it can be lifted.
. A, correct B, wrong [answer]: B
123. Under the end beam of the sliding line end of the bridge crane , a protective plate should be provided to prevent accidental contact between the spreader or the wire rope and the sliding line.
A. Correct
B. Wrong [Answer] A
124. If overloading is required under special circumstances, it must not exceed 10% of the rated load and work under the supervision of professional and technical personnel. l
A. Correct
B. Wrong [Answer]: A
125. In the event of a sudden power failure, the main circuit switch should be cut off immediately, and then all control handles should be turned to the zero position.
A. Correct
B. Wrong [Answer]: A
126. The open-air crane should stop working if it encounters winds above () level. A, six B, seven C, eight [Answer] A
127. When the lifting load reaches the rated lifting capacity of the crane () and above, the heavy object should be hoisted at a height of 50~200mm, and the crane brake should be checked for stability, heavy objects, lashing, and confirmation before lifting. A, 80% B, 90% C, 100% [Answer] B
128. The closer the cargo lifted by the hoisting mechanism's wire rope is to the ground, the swing amount of the cargo when the crane is luffing and rotating stops ()
A, increase B, decrease [Answer]: A
129. The thickness of the rim of the brake wheel of the brake of the lifting mechanism has worn out () should be replaced. A, 25% B, 40% C, 50% [Answer] B
130. When lifting operations in high places require vertical operations up and down, special () or other isolation measures must be set up.
A. Warning signs
B. Shelter
C. Red line alert [Answer] B
131. Cranes (), hooks are not allowed to hang spreaders, hanging objects, etc. A. Before the start of work B, after the work is completed C, during the work [Answer] B
132. The main content of crane maintenance is adjustment, lubrication, tightening and () A, cleaning B, minor repair C, test run [Answer]: A
133. The safety factor of steel wire ropes suspended and tied during use should not be less than () A, 4B, 5C, 6 [Answer] C
134. When two cranes lift an object, the driver should ()
A. You can choose the method according to your own control situation
B. The slowest work
C. Strictly obey the command
D. Hoisting according to the plan made beforehand [Answer]: CD
135. The safety inspection of the lifting mechanism should be checked ().
A. Motor
B. Height limiter
C. Load protector
D. Damage to pulleys, wire ropes, and coils [Answer]: BCD
136. The operation of the lifting mechanism can be divided into A, light load lifting B, medium load lifting C, heavy load lifting D, overload lifting [answer] ABC
137. Crane safety protection devices include ()A, torque limiter B, luffing limiter C, walking limiter D, operating limit [Answer]: ABC
138. When a fire occurs in electrical equipment during crane operation () extinguish
A. The power should be cut off immediately
B. Use 1211 fire extinguisher
C. Foam fire extinguisher
D. Use carbon dioxide fire extinguisher [Answer]: ABD
139. In order to achieve a smooth lifting, the operation should be ().
A. Avoid using long hanging cables
B. It is forbidden to push files quickly
C. The walking mechanism gradually accelerates
D. It is forbidden to start suddenly [Answer]: BCD
140. When the overturned object is dumped on its own, it is necessary to start the lifting mechanism lifting hook against the trend and control its descending speed. When dropping the hook, keep the hook vertical.
A. Correct
B. Wrong [Answer] B
141. There are two types of climbing operations, one is the driver's operation, and the other is the driver's overhaul of equipment and main parts. A. Correct B. Wrong [Answer] B
141. The splint of the rope clamp should be invaded by the long wire rope. A, correct B, wrong [answer] A
142. Drivers are not allowed to operate cranes whose safety devices have failed. A, correct B, wrong [Answer] A
143. When the driver is handing over shifts, he should report the breakdown of the equipment. A, correct B, wrong [answer] A
144. Drivers must strictly abide by the shift system and do a good job of shifting shifts. A, correct B, wrong [answer] A
145. When parking the stable hook, when the hanging object swings forward, you should immediately follow the car with a low speed gear for 1 to 2 times. A, correct B, wrong [answer] A
146. The swing of the hook is generally caused by two forces, A, correct, B, and wrong. It is the horizontal force and the other is the vertical force. [Answer] B
147. Safety measures must be taken when lifting oxygen cylinders, acetylene and other pressure vessels and dangerous goods. A, correct B, wrong [answer] A
149. After shutting down in areas below 0°C in winter, the coolant should be drained completely. A, correct B, wrong [answer] A
150. Sufficient lighting should be provided when the crane is operating at night. A, correct B, wrong [answer] A
151 When the crane is fully loaded, it can do two mechanical actions at the same time in operation. A, correct B, wrong [answer]: B
152. During crane operation, the hanging objects are not allowed to stay in the air for a long time, and the driver is not allowed to open the driver's cab when the hanging objects are unknown. A. Correct B, Wrong [Answer] A
153. Before lifting operations, you must wear personal protective equipment carefully. A, correct B, wrong [answer]: A
154. The thermal relay can play the role of motor overload protection. A, correct B, wrong [answer] A
155. Stable, accurate, fast, safe and reasonable are the basic requirements of crane driver operation. A, correct B, wrong [answer]: A
156. One of the reasons why the motor is still running after the limit switch is activated is that a short circuit occurs in the limit switch. A. Correct B, Wrong [Answer]: A
157. It is strictly forbidden to use cranes other than manned to carry personnel. A, correct B, wrong [answer] A
158. There should be foam fire extinguishers in the crane operating room and machine room. A, correct B, wrong [answer]: B
159. Repair and maintenance work should not be carried out when the crane is in working condition. A, correct B, wrong [answer]: A
160. The overloading of cranes is one of the important reasons for broken hooks and broken ropes. An overload limiter should be set up in accordance with the regulations and carefully adjusted and checked frequently. A, correct B, wrong [answer] A
161. The crane shall move the cargo along the hoisting safe passage. A, correct B, wrong [answer] A
162. The secondary maintenance work of the crane is carried out every six months. ()A, correct B, wrong [answer]: A
163. The primary maintenance of the crane is carried out every quarter. A, correct B, wrong [answer] B
164. The crane hook should be annealed every two years to avoid cracks due to fatigue. A, correct B, wrong [answer]: A
165, the role of クレーン部品 lubrication is () A, reduce wear B, prevent corrosion C, seal dust D, improve quality [Answer]: ABC
166, track gauge ( ) Is represented by what letter. A, KB, LC, S [Answer] A
167. The amount of oil in the gearbox should be () A, sufficient B, a small amount C, moderate [Answer]: C
168. Push the handle to the first down gear, which is suitable for long-distance () object dropping techniques. A. Heavy load B, medium load C, light load [Answer]: C The ground wire shall have at least () in every 50m distance. A, 2 roots B, 4 roots C, 5 are very [answer] B
169. It is often in the closed state. When the mechanism is working, it is released by the action of external force. This kind of brake is called ().
A, normally closed
B. Normally open
C. Brake shoe type [Answer] A
172. The hook of the electric crane can be started when it is empty, and the hook cannot be started when the hook is heavy, indicating the lifting mechanism ()
A, damage
B. Load
C. The motor is damaged [Answer]: B
173. The distance between the track sweeping plate and the track surface should not be greater than ()A, 5mm B, 10mm C, 100mm [Answer] B
174. The ascending limit position limiter stipulates that the ascending action should be stopped at the point where the hook height limit position is not less than () at the rated speed.
A, 50 mm
B, 80 mm
C, 100 mm [Answer] C
175. The equipment is bound firmly and the main bearing point () the center of gravity of the equipment to prevent tipping. A, lower than B, higher than [answer] B
176. The driver must () A, power on B, overhaul C, ring the bell before moving the car and before lifting [Answer] C
177. When the driver and relevant personnel inspect and maintain the crane, the control power supply should be cut off and hung up ().
A. Signal light
B. Prohibited signs
C. Red and White [Answer] B
178. The driver implements the inspection system per hour. A, 1B, 2C, 4 [Answer] B
179. During the operation of the driver, if there is an abnormal appearance or malfunction of the observation equipment, the driver should ().
A. Stop work immediately and find out the cause
B. Hurry up to the position
C. Clear instructions while hanging [Answer] A
180. The driver must obey the command of () during operation, but he should stop urgently when he sends a dangerous signal to anyone.
A. Leadership
B. Lifting command
C. Lifting workers [Answer] B
181. Crane drivers must do when operating cranes ()
A. Lifting and landing speed evenly
B. It is strictly forbidden to be fast or slow
C. The rotation should be stable
D. It is forbidden to walk [Answer]: ABCD
182. Crane drivers must do this during operation ()
A. Smooth starting and braking
B. The hook or load does not sway
C. Accurate points of hanging objects
D. Obey the command signal of the commander [Answer] ABCD
183. The "ten no-lifting" regulations for lifting machinery are ()
A. Do not lift the rated load
B, slanting and not hanging
C. Illegal command is not suspended
D. The slings and accessories are not tied to the car or crane [Answer]: ABCD
184. Which types of crane repair are divided into () A, special repair B, minor repair C, medium repair D, overhaul [Answer]: BCD
185. There are () A, electric shock B, electric spark burn C, bruise D, smash injury caused by electric shock in crane [Answer]: AB
186. Electrical sparks usually cause large areas of the human body () A, scratches B, scalds C, and burns [Answer] C
187. The hook is not above the item ((), so it is not allowed to lift. A. Surface B, center of gravity [Answer]: B
188. When the lifted heavy objects land, the crane should use () A, fast landing B, slow landing [Answer]: B
189. The height of the hoisted object should generally be higher than the highest obstacle () meters. A, 0.5B, 1C, 1.5 [Answer] A
190. For the lifting mechanism for lifting hot metal or inflammable and explosive dangerous goods, each set of driving device should be equipped with () brake.
A. One set
B. Two sets
C. Three sets of [Answer]: B
191. The dynamic load test is loaded at () times the rated load. A, 1B, 1.1C, 1.25 [Answer] B
192. During the flipping operation, when the object flips by itself under the action of the gravity tipping moment, the handle should be reported to ()
A, zero position
B. Raise the first gear
C. Drop the first gear [Answer]: C
193. For steel wire ropes used daily, check the fixed connection balance pulleys at the ends and make safety judgments.
A. Daily
B. Monthly
C. Every year [Answer]: A
194. When carrying out a static load test on a double trolley crane, the main hooks of the two trolleys should be tested.
A, respectively
B. At the same time
C. Choose one [Answer] B
195. The driver must obey the command of the commander. When the command signal is unknown, the driver will send a "repeated" signal to ask, and only after the command intention is clear, can the driver drive. A, correct B, wrong [answer] A
196. Inclined pulling and oblique cranes are not only easy to cause load lifting, but also make the objects swing unstable after being hoisted, and it is easy to cause the wire rope to fall out of the winding trough. A, correct B, wrong [answer] A
197. The hook of the electric crane hoisting mechanism can start and complete the hoisting when the load is lifted, indicating that the crane will not be dangerous.
A. Correct
B. Wrong [Answer] B
198. When the crane is overhauled, a cordon should be set in the lower section to prohibit people from passing. A, correct B, wrong [answer] B
199. The crane's minor repairs or major repairs are the work of the repairman and have nothing to do with the driver's own job. A. Correct B, Wrong [Answer] B
200. Before starting the crane, the main contactor should be engaged, and the operating levers should be placed in the neutral position. A, correct B, wrong [answer] B
201. When a crane is lifting heavy objects, a trial hoist must be carried out, and the height of the trial hoist should not be greater than 1.5 meters. A, correct B, wrong [answer]: B
203. The general environment of the insulation resistance on the crane should not be less than 0.8M megohm. A, correct B, wrong [answer] A
204. The safety belt can be tied to the railing when the crane is climbing. A, correct B, wrong [answer] B
205. The wire rope with line contact is currently widely used on cranes. A, correct B, wrong [answer]: A
206. The brake of the hoisting mechanism on the crane must be able to reliably brake 1.25 times the rated load. A. Correct B, Wrong [Answer] A
207. The crane driver must strictly guard his work position and shall not leave the crane without authorization. A, correct B, wrong [answer]: A
208. The operation of the crane driver should be carried out according to the command signal . No matter who sends the emergency stop signal, it should be executed immediately. A, correct B, wrong [Answer]: A
209. The brake of the hoisting mechanism adopts the normally open type. A, correct B, wrong [answer] B
210. When the brake of the lifting mechanism suddenly fails, the driver should cut off the power immediately. A, correct B, wrong [answer]: B
211. The brake of the lifting mechanism suddenly fails during work. The driver must be calm and calm. If necessary, report the controller to a low gear and perform repeated lifting actions.
, At the same time, choose a safe place to put down the heavy objects. A, correct B, wrong [answer] A
212. Lifting electromagnets to suck and lift rusty steel or sandwich steel is a normal operation. A, correct B, wrong [answer] B
213. For the steel wire rope used by the crane, its () should meet the requirements of the operation manual for this type of crane.
A, structure type
B. Specifications
C, stiffness
D. Intensity [Answer] ABD
214. If a short circuit or severe overload occurs in the circuit, the power supply should be cut off quickly and rely on the overcurrent relay. A. Correct B. Wrong [Answer] A
215. If any damage or defect is found in the special lifting tool, reasonable repair measures must be taken, otherwise it is not allowed to be used. A. Correct B, Wrong [Answer] A
216. The crane safety technical file must have its safety accessories, safety protection devices, measurement and control devices and daily maintenance records of related auxiliary instruments. A, correct B, wrong [answer] A
217. It is strictly forbidden to use () to replace the control mechanism. A. Brake B, limiter C, contactor D, limit device [Answer]: BD
218. It is strictly forbidden to hang on the metal structure of the installed crane ()
A. Placard
B. Billboard
C. The rotation should be stable
D. Windshield objects [Answer]: ABC
219. There are () in the lifting mechanism. A, motor B, transmission device C, winding system D, picking device [answer] ABCD
220. The requirements of "ten no-lifting" for lifting operations are listed below. The correct ones are () A. The work piece is tied up, and the hanging is not securely suspended. B. The slinger does not wear the safety frame and does not hang C. The sling is scrapped. Standard or safety device failure, no hanging D, no padding between the corner of the heavy object and the hanging wire, no hanging [Answer]: ACD
221, the "ten no hanging" requirements for lifting operations, the correct ones listed in the following table are () A, The command signal is unknown or the command is not lifted B, the weight of the object is not clear or the load is not lifted C, the oblique object is not lifted D, the dangerous goods are not lifted [Answer]: ABC
222. The requirements of "ten no lifting" for lifting operations are listed below which are correct (). A. People standing on heavy objects or floating objects shall not be hung B, the work site shall be dim and shall not be hung C, bulky and large objects shall not be hung D, the workpiece shall not be hung in the ground [Answer]: ABD
223. When lifting heavy objects, you can hang any heavy objects on the heavy objects. A, correct B, wrong [answer] B
225. The hoisting wire rope wears too fast, check whether the pulley rotates and whether the bearing is damaged, and whether the wire rope size specification is consistent with the design value
, And whether the wire rope is short of oil. A, correct B, wrong [answer] A
226. For cranes with high lifting heights, there should be devices or measures to prevent the wire ropes and spreaders from rotating. A. Correct B. Wrong [Answer] A
228. Kerosene should be used for cleaning when there is oil stains on the brake wheel. A, correct B, wrong [answer] A
229. The various joints of the brake should be free from jamming or breakage, and the movement should be flexible. A, correct B, wrong [answer] A
230. The purpose of adjusting the working stroke of the brake is to obtain a suitable braking torque. A, correct B, wrong [answer] B
231. The stroke limiter should ensure that the power supply is automatically cut off when the mechanism runs to the limit position. A, correct B, wrong [answer] A
232. It is strictly forbidden to use the method of free descent to drop heavy objects. A, correct B, wrong [answer] A
233. Hanging objects is strictly prohibited to hang in the air for a long time. A, correct B, wrong [answer] A
234. It is strictly forbidden to use cranes for oblique pulling, oblique lifting, and lifting of heavy objects that are set up underground or solidified on the ground and other objects of unknown weight
A. Correct
B. Wrong [Answer] A
235. It is strictly forbidden to directly hang heavy objects with a hook. A, correct B, wrong [answer]
236. Generally, two or more cranes can be used to lift a heavy object at the same time. A, correct B, wrong [answer]: A
237. In the event of a fire, report to the police immediately. Call 119 for the police. Correct B, Wrong [Answer] A
238. Once a fire breaks out, the materials affected by the fire must be dispersed immediately, and the flammable and explosive materials should be removed first. () A, Correct B, Wrong [Answer] A
239. The brake of the lifting and luffing mechanism of the crane should be adjusted under load. A, correct B, wrong [answer]: B
240. The crane used for somersaulting objects should have two sets of lifting mechanisms, the main and the auxiliary. A, correct B, wrong [answer] A
241. Before a railed crane runs, the rail hook, rail surface, cable trough and all obstacles that affect the running must be cleared.
A. Correct
B. Wrong [Answer]: A
242. Before the railed crane runs, the tracing device or the rail device must be loosened. A, correct B, wrong [answer] A
243. For cranes with two sets of main and auxiliary lifting mechanisms, two sets of mechanisms should be used for operation at the same time. A, correct B, wrong [answer] B
244. During the operation, in the event of an unexpected accident, the driver must keep a clear head and calm the operation, and must not panic.
245. In damp or severely corrosive places, grounding stakes should be painted with anti-corrosion treatment. A, correct B, wrong [answer] B
246. When hitting a reverse car, the motor will produce a strong mechanical impact, and damage accidents will occur, so it is not allowed under normal circumstances.
A. Correct
B. Wrong [Answer]: A
247. Hoisting and hoisting are not allowed after the twisted and tensioned steel wire rope is passed through a certain angle. A, correct B, wrong [answer] A
248. If an electric shock is found, the electric shock should be removed from the electric current as soon as possible. A, correct B, wrong [answer] A
249. When working at heights, it is not allowed to throw sundries and parts on the ground. A, correct B, wrong [answer]: A
250. During the hoisting process, the height of the object to be hoisted should be more than 0.5 meters higher than the ground equipment or other objects. A. Correct B, Wrong [Answer] A
251. When disassembling, repairing or inspecting the crane in the air, you must wear a seat belt. A, correct B, wrong answer A
252. To carry out lifting operations in the chemical zone, you must abide by other safety regulations in the chemical zone, A, correct B, wrong [Answer]: A
253. After the work is completed, all controller handles should return to the zero position. A, correct B, wrong [answer]: A
254. It is strictly prohibited to use it to directly correct a sling that has been tensioned by a heavy object during work. A, correct B, wrong [answer]: A
255. Before turning off the main power supply, all working handles should be placed in the zero position. A, correct B, wrong [answer] A
256. The setting value of the overcurrent relay should be adjusted to 2.5-2.75 times of the rated current of the motor. A, correct B, wrong [answer] B
257. Frequently check the heating of the reduction box, especially the bearing, the temperature must not rise () A, 100℃ B, 80℃ C, 50℃ [Answer]: B
258. Use electromagnetic principles or working principles to delay The automatic control electric appliance that the contact is closed or disconnected is () relay.
A. Time
B. Overcurrent
C. Heat [Answer]: A
259. The two forearms are placed horizontally in front of the chest, the five fingers are stretched out, the palms of the palms are facing down, and the gesture signals indicating that they are swung horizontally to both sides ().
A, hook stop
B. Stop
C. Emergency stop [Answer]: C
260. After the crane working in the open air is finished, () measures should be taken to secure the car to prevent it from being blown away by the wind.
A, hook
B. Lifting mechanism
C, heavy objects
D. Big cart, small cart [Answer]: D
261. Cranes working in the open must be equipped with anti-wind and anti-skid devices to prevent being blown by strong winds. The common rail device for large cranes is ().
A. Manual
B. Electric spring type
C. Hydraulic spring type [Answer]: C
262. Lifting operations are highly technical, with a high degree of mechanization during the operation, and generally no casualties will occur.
A. Correct
B. Wrong [Answer] B
263. The electrical equipment of the crane must ensure that the transmission performance or control performance is accurate and reliable, and can cut off the power supply and stop safely in an emergency.
A. Correct
B. Wrong [Answer]: A
264. Before hoisting heavy objects, first try hoisting. The height of the hoisting test is below () m. After confirming that there is no danger, then hoist. A2 B1.5 C0.5 [Answer] C
265. Most important or precise parts use the () method to turn over objects. A, swim flip B, belt flip C, aerial flip [Answer]: C
266. The correct method of heavy-duty lifting operation is to quickly push the handle to () A, first gear B, second gear C, and required gear [Answer]: B
267. The belt turning operation actually uses the () of the operating mechanism to turn the object. A, false B, inclined operation C, acceleration [Answer]: B
268. When certain parameters reach a predetermined value, they can automatically act, so that the electrical appliance that changes the circuit is called ()
A. Relay
B. Contactor
C. Fuse [Answer] A
269. When the motor capacity is large, the operating frequency is high, and the speed is well adjusted, the jog performance should be selected (). A, reversing switch B, cam controller
C. Master controller [Answer] C
270. The key to the safety of crane operation is (). A. Maintenance of crane B. Operation specification of hoisting mechanism C. Operation of traveling mechanism
[Answer] B
271. The role of the rim of the crane wheel is () A, reduce wheel pressure B, uniform wheel pressure C, guide and prevent derailment [Answer]: C
272. Only small objects with fixed hooks are hoisted and transported. Generally, two or more hoisting wire ropes are used for hoisting goods. A, correct B, wrong [answer] A
273. A crane with only one set of brakes cannot lift hot molten metal. A, correct B, wrong [answer] A
274. The commanding personnel shall observe closely and send out the operation signal after ensuring safety. A, correct B, wrong [answer]: A
275. When cracks appear on the brake wheel, it can be repaired by welding. A, correct B, wrong [answer] B
276. The button switch is a low-current electrical appliance that acts when the hand is pressed, and releases and resets when the hand is released. A, correct B, wrong [answer] A
277. The three-phase switch knife on the protection switchboard can pull the switch knife with load. A, correct B, wrong [answer] B
278. It is strictly forbidden to wash with water when maintaining electrical equipment. A, correct B, wrong [answer] A
279. When the object to be turned over is turned over by the moment of gravity, the hook should be dropped at the slowest descending speed for stability. A. Correct B, Wrong [Answer]: B
280. The cart or cart should be moved backwards quickly to adjust the position of the car body while the overturned object is dumped under the action of the gravitational moment.
A. Correct
B. Wrong [Answer]: A
281. The overall circuit of the crane is composed of ().
282, A, AC circuit B, lighting circuit C, main circuit D, control circuit [Answer] BCD
283. The reason why the crane cannot start may be () and so on. A, overload day B, no electricity, or fuse burn out C, emergency switch, safety switch is not closed D, the controller handle is not placed in the zero position [Answer] ABCD
284. Crane maintenance is divided into daily maintenance, primary maintenance and secondary maintenance A, correct B, wrong [answer] A
285. The amplitude of the crane should be slow and steady. It is strictly forbidden to change gears before the boom is not stable. When the crane load reaches 90% or more of the rated lifting capacity, it is strictly forbidden to lower the boom. A, correct B, wrong [answer] A
286. Cranes must not lift heavy objects that are underground or adhered to the ground. A, correct B, wrong [answer] A
287. The lifting mechanism can be stopped with a height limiter. A, correct B, wrong [answer]: B
288. The lifting mechanism should adopt a normally closed brake. A, correct B, wrong [answer]: A
289. The more oil in the gearbox, the better. A, correct B, wrong [answer]: B
290. The gear key in the reduction box is loose and can be used continuously. A, correct B, wrong [answer] B
291. The method for the no-load descent operation is to push the handle to the descending () gear than the skill is more appropriate. A, one B, two C, three [Answer] C
292. If someone gets an electric shock, he should quickly (). A. Make an emergency call B. Make the person who is shocked immediately get out of the power source. C. Report to the leader [Answer] B
293. It is a way to prevent the controller from being in the zero position and the stator circuit of the motor to be connected, so that the rotor circuit can transmit power when the resistance is small ()
A. Zero pressure protection
B. Zero protection
C. Itinerary protection [Answer] B
294. When the wire rope is braided and fixed, the length of the braided part shall not be less than the diameter of the wire rope ()
A, 10 times
B, 20 times
C, 30 times [Answer] B
295. The driver goes up and down the crane in the prescribed passage, and is not allowed to hold any objects. A, correct B, wrong [answer]: A
296. The height-climbing operation referred to refers to the operation above 2 meters, and it is not necessary to wear a seat belt. A, correct B, wrong [answer]: B
297. The second short tone of the whistle signal is decreasing. A, correct B, wrong [answer]: B
298. The work of the crane driver is carried out in close cooperation with the lifting commander and the lashing hook personnel. A. Correct B. Wrong [Answer] A
299. The duty of the crane driver is only to drive the car, and to ignore the maintenance. A, correct B, wrong [answer] B
300. After the crane driver's work is over, place all handles at the zero position, and the crane can be opened high. A, correct B, wrong [answer] B
301. The crane driver should remember the best handover content every day. A, correct B, wrong [answer] B
302. The crane driver should pay close attention to the operation of the crane. If the equipment has abnormal observations or malfunctions, it should be reported or eliminated in time. It is strictly forbidden to operate the crane with diseases. A, correct B, wrong [answer] A
303. The crane driver shall execute the command signal of anyone. A, correct B, wrong [answer]: B
304. The crane driver shall abide by the "ten no-lift" regulations for lifting operations. A, correct B, wrong [answer] A
305. In addition to strengthening self-protection during operation, crane drivers should also consider the safety of national property and the lives of others.
A. Correct
B. Wrong [Answer]: A
306. The purpose of adjusting the electromagnet stroke of the short-stroke electromagnet pad brake is to release the brake, the gap between the left and right brake shoes and the brake wheel is equal
. A, correct B, wrong [answer] B
307. Implement a preventive, planned, and predictive maintenance work system for cranes. A, correct B, wrong [answer]: A
308. Perform a comprehensive inspection of the crane, and only push and close the knife of the protective cabinet when it is confirmed that it does not affect the work. A. Correct B. Wrong [Answer] A
309. The basic requirement for the driver to operate the crane is to be stable, accurate, fast, safe and reasonable in operation. A. Correct B, Wrong [Answer] A
310. It is found that someone is electrocuted, and the power cannot be cut off for some reasons . Proper measures should be taken to make the shocked person get out of the charged body quickly under the premise that the rescuers are safe. A, correct B, wrong [answer] A
311. If the Faguan steel wire rope is flattened, twisted, knotted, loose strands, broken strands, hemp core exposed, annealed, burnt, severely damaged should be scrapped.
A. Correct
B. Wrong [Answer] A
312. In the event of electrical equipment failure, you should immediately report to the equipment department to ask an electrician to come and repair it, and do not do it yourself. A. Correct B, Wrong [Answer]: A
313. After the operation, the boom should be turned downwind and the hook should be placed on the ground. A, correct B, wrong [answer] B
314. After the operation, the hook should be raised to the device close to the upper limit, release the brake of the slewing mechanism, close all doors and windows, and cut off the power supply.
A. Correct
B. Wrong [Answer]: A
315. When the lifting electromagnet is lifting objects, pay special attention to its passage, and it is not allowed to pass over people and equipment. A. Correct B, Wrong [Answer]: A
316. Before stopping, when the hanging object swings forward, immediately follow the car with () for 1 to 2 times to stabilize the hook.
A, low speed
B, medium speed
C. High speed [Answer]: A
317. The hook of the hoisting mechanism of the electric crane can be started when the load is lifted, indicating ()
A, transmission capacity is too strong
B. The load limiter is damaged
C. The motor selection is too large [Answer]: B
318. For the purpose of work, the spreader can also carry people when it is heavily loaded. A, correct B, wrong [answer] B
319. There is no need to install the anti-falling device on the hook for quick installation and quick release. A, correct B, wrong [answer] B
321. In order to stop the motor in operation, the method of turning off the power can be adopted. A, correct B, wrong [answer] B
322. To ensure the safety of the human body, the grounding resistance at any point on the crane should be greater than 4 ohms. A. Correct B, Wrong [Answer] B
323. In order to stop the running motor, the method of turning off the power can be taken. A, correct B, wrong [answer] B
324. During operation, the maximum elevation angle of the crane's boom must not exceed the factory regulations. When there is no information to check, it must not exceed 80 degrees Celsius.
A. Correct
B. Wrong [Answer] B
325. The uncoordinated actions of various mechanisms during operation caused accidents in which the lifting weight collided with other obstacles. A, correct B, wrong [answer] A
326. Doing a good job of cleaning, replenishing, lubricating, tightening, and adjusting is to ensure the safe operation of the crane. A, correct B, wrong [answer] A
327. Electrical faults, such as short-circuit, overload, and motor lack of electrical faults, will cause the voltage to increase sharply, the temperature rises, and cause a fire. ()
A. Correct
B. Wrong [Answer] B
328. Destruction of electrical insulation and poor grounding can cause electric shock and casualties. A, correct B, wrong [answer] A
329. The maintenance and inspection of the electrical control system is not timely, and the operation is ill, which causes the mechanism to produce vibration and shock, which leads to damage and accidents.
A. Correct
B. Wrong [Answer] A
330. If there is an electrical fire, the power should be cut off first. When the power is not cut off, it is forbidden to use foam, acid and alkali fire extinguishing equipment to extinguish the fire to prevent electric shock. A. Correct B. Wrong [Answer]: A
331. Grounding terminals and grounding signs should be provided on the electromagnet housing of the grid-powered electromagnet, which is one of the safety technical requirements for electromagnets.
A. Correct
B. Wrong [Answer] A
332. Resistors should be divided into starting resistors and starting speed regulating resistors according to their uses. A. Correct B. Wrong [Answer]: A
333. The hook should be cleaned with kerosene first, and then checked with a 20-fold magnifying glass. If there is a crack, it should be scrapped. A. Correct B, Wrong [Answer] A
334. It is forbidden to carry a lighter when carrying out dangerous hoisting operations. A, correct B, wrong [answer] A
335. It is forbidden to place tools, parts or sundries on all parts of the crane. A, correct B, wrong [answer] A
336. Check the crane frequently and carefully, do a good job of adjustment, lubrication, tightening, cleaning, etc., to ensure the normal operation of the mechanism is called maintenance.
A. Correct
B. Wrong [Answer] A
337. During the static load test, the trolley should be parked in the middle of the span. A, correct B, wrong [answer]: A
338. The hoisting wire rope is incorrectly wound on the roll or pulley. If there is a metal rod or rod for adjustment, it can be used to move.
A. Correct
B. Wrong [Answer] B
339. Control the lifting speed to achieve "fast at both ends and slow in the middle". A, correct B, wrong [answer] B
340. When contacting first aid and calling for help, the patient should be briefed on the situation so that the ambulance staff can be prepared and put into rescue as soon as they arrive.
A. Correct
B. Wrong [Answer] A
341. Two or more people are engaged in lifting operations, and one person must be the lifting commander, A, correct B, wrong [Answer] A
342. Zero position protection is to prevent accidents when the controller handle is not in the zero position, cutting off the power supply and retransmitting power, causing the motor to run.
A. Correct
B. Wrong [Answer]: A
343. Loss of voltage protection is to automatically disconnect the main circuit from the power supply in the event of a power failure (the voltage is zero or the circuit voltage is too low).
A. Correct
B. Wrong [Answer]: A
344. During open-air maintenance, high-altitude operations are prohibited due to strong winds above level 6. A, correct B, wrong [answer] A
345. The two-way limit of the screw type limiter can not only limit the over-winding, but also prevent the hook from landing and then unwinding the wire, which will cause the wire rope to be twisted.
A. Correct
B. Wrong [Answer]: A
346. Items buried underground can be hoisted as long as they are well tied up firmly. A, correct B, wrong [answer] B
347. Before each lifting, the hook head should be adjusted to the vertical line of the center of gravity of the object to be lifted. A, correct B, wrong [answer] A
348. A trial run must be performed every time the molten metal is lifted and the full load is lifted in each shift. A, correct B, wrong [answer] A
349. When hoisting scattered materials, they must be packed in nets and bags with sufficient strength, and they must not be tied and hoisted directly. A. Correct B, Wrong [Answer] A
350. When lifting the group leader materials, the materials must be tied at least in two places, and they must be in a stable state. A, correct B, wrong [answer] A
351. The purpose of adjusting the working length of the main spring is to obtain a suitable braking torque. A, correct B, wrong [answer]: A
352. The purpose of adjusting the working length of the main spring is to obtain a proper amount of expansion of the brake shoe. A. Correct B, Wrong [Answer] B
353. When jacking, the oil pressure of the hydraulic system is too high and it is easy to damage the hydraulic system. A, correct B, wrong [answer] A
354. The purpose of the dynamic load test is to verify the accuracy and reliability of the crane's various mechanisms and brake performance. A. Correct B, Wrong [Answer] A
355. The dynamic load test should be carried out separately first, and then the joint action test. A, correct B, wrong [answer]: A
356. The steel wire rope must be hung in the middle of the side of the object during the tumbling operation. A, correct B, wrong [answer] B
357. The flipping operation is generally used for objects that are afraid of collision. A, correct B, wrong [answer] B
358. Inclined hanging and oblique pulling of heavy objects will increase the work load, and the heavy objects will swing, which will have an adverse effect on the steel wire rope and pulley, and it is also easy to cause accidents.
A. Correct
B. Wrong [Answer]: A
A, greater than
B, less than
C. Interlinked response [Answer] C
360. For lifting electromagnets without special requirements, the safety factor is generally () A, 2 B, 3 C, 6 [Answer]: A
361. The special electromagnet for absorbing and transporting steel plate and section steel should be equipped with a sound and light alarm device when the voltage is lower than the rated voltage of the electromagnet ().
A, 85%
B, 100%
C, 110% [Answer]: A
362. The forearm is stretched to the side and upward, and the five fingers are stretched out white, higher than the shoulders. The gesture signal that takes the wrist as the axis to rotate is said ().
A. Hook down
B. The hook rises
C. Indicate the landing position [Answer]: B
363. When an object is suspended obliquely, the object and the hook are moved under the action of the component force of gravity, which results in the () swing of the hook.
A. Level
B. Vertical [Answer]: A
364. It is strictly forbidden for the electromagnetic chuck to pass over people and equipment. It is required that the operating range is within a radius of () meters, and people are not allowed to stand. A5 B6 C7 [Answer] A
365. To turn the object 90 degrees in the air (e.g., ladle (), the auxiliary hook should be hung on the () part of the hanging object. A, upper B, middle C, lower [Answer]: C
366. In the event of a fire, you should call () immediately to report to the fire department while being calm, calm, and swift to rescue.
A, 110
B, 119
C, 120 [Answer] B
367. When the hanging object swings forward during operation, the gear position () of the controller should be adjusted in the swing direction of the hanging object to stabilize the hook.
A. Increase
B, test,
C. Put to the zero position [Answer] A
368. The steady hook in place should follow the car to (). Follow the car back again. A. The maximum swing B, half of the maximum swing C, 1/4 of the maximum swing [Answer] A
369. The operating limit position limiter is composed of a safety ruler and (). A. Emergency switch B, limit switch C, knife switch [Answer] B
370. What constitutes the limit switch and the limit switch () A, buffer B, safety ruler C, anchoring [Answer] B
371. In the process of hoisting, the hoisted object should be higher than the ground equipment or other objects () A, 0.5m B, 1m C, 1.5m [Answer] A
372. When the lifting limit position limiter fails, the driver Accurate operation should be based on experience. A, correct B, wrong [answer] B
373. Before turning on the main power, all controller handles should be set to zero. A, correct B, wrong l [Answer] A
374. It is not allowed to use the lifting limiter for lifting and parking. A, correct B, wrong [answer] A
375. Lubricants of different brands can be mixed for use. A, correct B, wrong [answer] B
376. When operating the electromagnetic chuck or grab crane , it is forbidden for any person to work or pass under the moving hanging objects. A. Correct B. Wrong [Answer] A
377. When operating the electromagnetic chuck or grab crane, the danger zone should be delineated and a warning sign should be set up to attract people's attention. A. Correct B. Wrong [Answer] A
378. It is not allowed to use limit switches as stop buttons to cut off the power during operation. A, correct B, wrong [answer] A
379. Commonly used fire extinguishers include dry powder, carbon dioxide and other fire extinguishers. A, correct B, wrong [answer]: A
380. It is not allowed to hoist if the load exceeds the rated load of the crane. A, correct B, wrong [answer]: A
381. The gear coupling is a rigid coupling, which cannot compensate for axial displacement and radial displacement. A, correct B, wrong [answer]: B
382. Inclined pulling with turning operation is a normal operation, as long as the angle of oblique pulling is not too large, it is allowed. A. Correct B, Wrong [Answer]: A
383. When the hanging object is placed on the ground, immediately drop the rope and unhook it. A, correct B, wrong [answer] B
384. When the hanging object needs to pass over the place where the ground personnel are standing, the signal should be sent before it can pass. A. Correct B, Wrong [Answer] B
385. When there is a crane operating on the track, add another one. Its safety ruler and limit switch should be installed in the same orientation as the original one to ensure reliable limit . A, correct B, wrong [answer] B
386. When the signal sent by the commander violates the regulations of the standard, the driver has the right to refuse to execute it. A, correct B, wrong [answer] A
387. Lubrication is one of the main contents of the crane driver's maintenance work. A, correct B, wrong [answer]: A
388. Three do not hurt yourself, not hurt others, and not be hurt by others. A, correct B, wrong [answer] A
389. When the lifting load reaches () or more of the rated lifting weight, it is strictly forbidden to perform two or more actions at the same time. A80% B85% C90% [Answer] C
390. When the crane driver is operating the crane, the speed must be uniform and it is strictly forbidden to brake quickly or slowly and suddenly. A. Correct B. Wrong [Answer] A
391. Lifting operations are highly technical. There is a lot of complexity and flexibility in the operation process. A slight error may cause accidents.
A. Correct
B. Wrong [Answer] A
392. In lifting operations, large diameter steel wire ropes can be used to make do with smaller components, and small diameter steel wire ropes cannot be used to bundle large objects for hoisting. A, correct B, wrong [answer] A
393. In the lifting operation, there is no problem with the light load, so it is a good way to improve the production efficiency. A. Correct B, Wrong [Answer] B
394. In lifting operations, the use of balance beams can increase the lifting height. A, correct B, wrong [answer]: A
395. Three conditions must be met for combustion: tender things, tender things, and ignition sources, all of which are indispensable. A, correct B, wrong [answer] A
396. Combustion is a chemical reaction that glows and generates heat. A, correct B, wrong [answer] A
397. Make a good handover system carefully so that problems can be discovered in time and prevent problems before they happen. A, correct B, wrong [answer]: A
398. No one is allowed under the boom under any circumstances, but the hanging objects can pass above people. A, correct B, wrong [answer]: B
399. If the fire is caused by electricity, the power should be cut off first, and the foam fire extinguisher can be used when the power is not cut off. A, correct B, wrong [answer]: B
400. The urgency of the whistle signal makes the long beep an emergency stop. A, correct B, wrong [answer] A
401. The electrical equipment cannot operate automatically after the power supply is restored. A, correct B, wrong [answer] A
402. After the heavy load is lifted to the position, the handle should be pulled back to the zero position one by one, and cannot stay in the () position. A. One B, Two C, Three [Answer] B
403. For heavy-load lowering operation, the handle cannot be placed in the lowering direction () gear. A, the first B, the second C, the slowest [answer] A
404. When the grab bucket is closed, the gap between the bucket contact should not be greater than ()A, 2mm B, 20mm C, 3mm [Answer] C
405. After the solitary bucket is opened, the difference in the parallelism of the bucket should not be too high () A, 2 mm B, 20 mm C, 3 mm [Answer]: B
406. () refers to the inspection and preventive maintenance of cranes before, during and after daily operation in order to detect hospital patients in time and maintain good working conditions. A. Regular maintenance B, secondary maintenance C, routine maintenance [Answer] C
407. Maintenance work is for the mechanics and has nothing to do with the crane driver. A, correct B, wrong [answer] B
408. The hook stabilization operation is to move the car's eyes to the direction of the hook support at the moment when the hook swings to the maximum range without the support of the support, that is, when the force in the direction of the swing reaches the maximum. A, correct B, wrong [answer] A
409. In any case, the crane is not allowed to conduct live inspection and maintenance. A, correct B, wrong [answer]: B
410. When the object is turned in the air, the main hook is hung on the lower hanging point of the turned object, so that the object will be turned in the air. A. Correct B, Wrong [Answer] B
411. The center of gravity of the object has nothing to do with how the object is placed, that is, no matter how the object is placed, its center of gravity is the focus of determination. A, correct B, wrong
[Answer]: A
412. During the lowering operation, the handle should be vibrated to the first gear and descend at the slowest speed first. A, correct B, wrong [answer]: B
413. The brake of the lifting mechanism must be able to reliably hold 1.1 times the rated load. A, correct B, wrong [answer] B
414. If the brake of the hoisting mechanism is adjusted too tightly, the wire rope will be subjected to excessive shock load, and the bridge vibration will be aggravated.
A. Correct
B. Wrong [Answer] A
415. The danger signal issued by the driver to anyone shall be implemented. A, correct B, wrong [answer] A
416. When the driver performs crane maintenance, he should cut off the main power supply, but it is not necessary to hang the sign. A, correct B, wrong [answer]: B
417. The driver should carry out a load test before working every day to check the reliability of the lifting brake. A, correct B, wrong [answer] A
418. If the driver finds an abnormal phenomenon or malfunction in the equipment or machinery, he should try to eliminate it after the end of the work. A. Correct B, Wrong [Answer]: B
419. The glass in the driver's cab should be flat and clean, and should not affect the driver's line of sight. A, correct B, wrong [answer]: A
420. When the driver uses a crane to lift or lift people and objects together during operation, they should () operate.
A. Allow
B. Prohibited
C. After approval by the leader, you can [Answer] B
421. The driver should be able to properly adjust the brakes of each mechanism according to the weight of the lifted goods, the length of the running route and the working conditions of different speeds, so that it can operate safely and reliably. () A, correct B, wrong [answer] B
422. The driver shall conduct a detailed inspection of the safety devices and main components of the crane before work. A, correct B, wrong [answer]: A
423. The crane is allowed to use the stopper as a means of stopping when the power is cut off. A, correct B, wrong [answer] B
424. On which side of the wire rope should the rope compression used by the wire rope be placed? A. Short-pass side B, Arbitrarily placed C, long-pass side [Answer] C
425, The braking capacity of the lifting mechanism should be rated Several times the weight A, 1.25 B, 1.1 C, 1 [Answer] A
426. When the wire rope is wound on the rotating roll, it should be guided by pulling or stepping on it to avoid overlapping of the wire rope. () A, correct B, wrong [Answer] B
427. For safety, the wire rope must be kept at least two turns on the coil. A, correct B, wrong [answer] A
428. The core organization of the crane is (). A. Lifting mechanism B, walking mechanism C, control mechanism [Answer]: A
429. When the main load-bearing component of the crane loses its overall stability () assembly line operation. A. Yes. B. Not allowed. C. It depends on the situation. [Answer] B 430. The control of the lifting height in crane lifting sometimes requires a lot of data ().
A, height limit
B. Driver's visual inspection ability
C. Lifting speed [Answer]: B
431. The crane driver should check the safety devices and main components of the crane before working. A, correct B, wrong [Answer]: A
432. Only when the crane is completely powered off, the lubrication operation is allowed. A, correct B, wrong [answer] A
433. Unmanned operation of the crane and insufficient night lighting. The driver can deal with it according to the situation. A, correct B, wrong [answer] B
434. The crane should adjust the brake of the lifting and luffing mechanism under load. A, correct B, wrong [answer] B
435. There are three types of wheels for cranes: single rim, double rim, and no rim. A, correct B, wrong [answer] A
436. At the end of the work, the controller should be returned to the zero position, cut off, violate the power supply, put away the tools, close all doors and windows and lock them.
A. Correct
B. Wrong [Answer] A
437. The power supply voltage should be checked before work, and the power supply voltage should not be lower than 360 volts. A, correct B, wrong [answer]: A
438. The crane shall issue a warning signal when the equipment fails during the hoisting process. A, correct B, wrong [answer] A
439. Cranes should be inspected and repaired frequently and in a timely manner when they are working. A, correct B, wrong [answer] B
440. When cranes pass railways, underground water pipes, underground gas pipes, cables and other facilities, they shall be protected by wooden boards and shall not be rotated on them. A, correct B, wrong [answer] A
442. The slip of the rotating parts of the crane should be the most effective way to lubricate with thin oil tanks during work. A, correct B, wrong [answer] B
443. When the crane rotates left and right, the movement should be stable, and the reverse movement should not be made before the rotation has not stopped. A. Correct B, Wrong IEl B [Answer]: A
444. When the crane is operating, the driver should first send out an acoustic signal to remind the personnel on the job site to pay attention. A, correct B, wrong [answer]: A
445. It is essential that irrelevant personnel are prohibited from entering the driver's cab during crane operation. A, correct B, wrong [answer]: A
446. During crane operation, if the power supply is interrupted, all handles should be moved to zero gear. A, correct B, wrong [answer]: A
447. In crane operations, when the binding and hoisting wire rope has an angle with the vertical line of the ship, the allowable lifting capacity increases with the increase of the angle. A, correct B, wrong [answer] B
448. Lifting weight refers to the maximum lifting weight when the basic boom is at its maximum (including rigging and lifting weight in tons. (). A, correct B, wrong [Answer]: A
449. After an accident occurs, the injured should be rescued quickly , The site does not need to be kept. A, correct B, wrong [Answer]: B
450. The driver must strictly implement the command signal of the full-time commander. A, correct B, wrong [answer]: A
451. Drivers are not allowed to request major vibrations, major repairs, arbitrarily altering the positions of components, parts or working procedures. A. Correct B, Wrong [Answer]: A
452. If a driver finds a malfunction during operation, he only needs to be careful and pay it when he is handed over. A, correct B, wrong [answer] B
453. Drivers generally use fixed ladders for climbing operations. Can't climb the ladder. A, correct B, wrong [answer]: A
454. When the driver performs maintenance on the crane, he should cut off the main power switch and put up a sign or lock it. If there are unremoved faults, the shift work should be done. A, correct B, wrong [answer] A
455. The driver must obey the command and can only drive after receiving the command signal from the on-site commander. A. Correct B, Wrong [Answer]: A
456. The driver must be familiar with the running performance of large and small cars, and master the running speed and braking distance of large and small cars. A. Correct B, Wrong [Answer]: A
457. When the crane is running under rated load, after the brake has braking action, under the false action, it will continue to move for a certain distance. This distance is called () . A. Working stroke B, safety stroke C, braking stroke [Answer] C
458. The safe voltage of crane portable lighting must be below () volts. A, 24 B, 36C, 220 [Answer]: B
459. When the crane is operating, the boom should be special to ()A, the wind direction B, the downwind direction C, the windshield direction [Answer] B
460. The periodic inspection of lifting equipment should be determined according to the heavy workload and harsh environment, but not less than every () times. A, month B, quarter C, year [Answer] C
461. When lifting heavy objects, if the handle is pushed to the second gear, it still cannot be lifted, except for electrical faults, it is likely to be ().
A. Power failure
B. Overload
C. Mechanical failure [Answer]: B
462. During the lifting operation, the driver is not allowed to open higher positions, in case of special circumstances ().
A. Yes
B. The hanging object must be raised to a safe passage height before leaving the post
C. You must place heavy objects on the ground before leaving the post [Answer] C
463. During light-load lifting operation, from zero to the largest gear, the stay time of each gear must be ()
A. Don't stay
B. More than 1 second
C. More than 2 seconds [Answer]: B
464. In order to keep the object stable during lifting, the center line of the hook and the center of gravity of the object must be at the position ().
A, the same horizontal position
B, the same vertical line
C. The same angle [Answer] B
465. In order to obtain a proper braking torque for the brake, it should be adjusted (). A. Electromagnet stroke B. Working length of main spring
C. The gap between the brake shoe and the brake wheel [Answer]: B
466. In order to eliminate the swing of the hook, the operator should pay attention to the observation. Generally, the swing range is large, and the distance to the car is only () A, small B, large [Answer] B
467. When the hook is stabilized, the swing of the hook is small, and the following distance should be () A, large B, small C, not sure [Answer] B
468. When the hook is stabilized, the following speed () A, should not be too fast B, should not be too slow C, not sure [Answer]: B
469. The operation of stabilizing the hook is to turn the eyes of the car in the direction of the hook support () at the moment when the hook is swung to the maximum extent and has not yet returned to the bracket.
A, the same
B. Reverse l [Answer] A
470. During use, the hook needs to be checked regularly but does not require lubrication. A, correct B, wrong [answer]: B
471. It is forbidden for the lifted heavy objects to make impact landing. A, correct B, wrong [answer] A
472. For bridge cranes with main and auxiliary hooks, the rated lifting capacity of the auxiliary hook is ()% of the main hook.
A, 10~20
B, 20-30
C, 30~40 [Answer] B
473. The ideal included angle for the sling is 60°~90° A, correct B, wrong [answer] A
474. The heavier the lifting and the faster the lift, the more severe the hook swing. A, correct B, wrong [answer] B
475. A warning signal should be issued when the hanging object approaches the ground staff during lifting. A, correct B, wrong [answer] A
476. The lifting weight is unreasonable, and the weight slips off after lifting, which will cause the jib to twist and lose stability and damage it. A, correct B, wrong [answer]: A
477. There must be safety technical measures for hoisting construction, otherwise hoisting operations are not allowed. A, correct B, wrong [answer]: A
478. The purpose of adjusting the gap between the two brake pads and the brake wheel is to ensure that the electromagnet has sufficient suction power to the cast iron. A. Correct B, Wrong [Answer] B
479. The dynamic load test load of the crane is the rated load (). A, 125% B, 120%. C, 110% [Answer] C
481. After the crane is finished, all () should return to the zero position. A. Control handle B, lifting mechanism C, cart D, trolley have been done [Answer] A
A, clean
B. Lubrication
C. Acceptance [Answer] C
483. The cause of the low starting speed of the crane is () A, insufficient battery power B, gas in the oil circuit C, and too small valve clearance [Answer] A
484. The setting value of the overcurrent relay of each motor on the crane should be adjusted to (Of motor rated current)
A, 1.5~2 times
B, 2~2.2 times
C, 4~7 times [Answer] B
485. Crane drivers must obey () A, business leaders B, team leaders C, and lifting command when lifting operations [Answer] C
486. The first-level maintenance of the crane should be once every () month. A, one B, three C, six [Answer]: A
487. No flammable and obstructive items should be placed in the driver's cabin to prevent electric shock and fire. A, correct B, wrong [answer] A
488. The sling cannot be lifted when the included angle of the wire rope is greater than 120°. A, correct B, wrong [answer] A
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